Ore-roaster.



A. R. WILFLBY.

011B RoAsTER.

A PPLIUATION FILED DBO. 11, 1908. 96 9,927. I .Patented Sept. 13,1910.

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ORE BOASTER.

APPLIoATIoN mmv nno.11. 190e.

969,927. Patented 13,1910.

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ORE ROASTBR.

PPLIUATION FILED 1320.11, 190g.

969, 927, Patented Sept. 13, 1910.

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OEE ROASTEB.

APPLICATION FILED DBO. 11, 1908.

Patented Septh 13,1910.

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ORB ROASTER.

APPLIOATION FILED 11110.11, 190s.

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Patented sept. 13,1910.

ARTHUR n. WILFLEY,

F DENVER, COLORADO, ASSIGNOR `OIF ONE-HALF TO JOSEPH` SEEP, QF SCRANTON, PENNSYLVANIA.`

OBE-MSTER.

To all who/in t 1mi/y concern:

Be it known that I, WILFLEY,

[a citizen of .the United safes, residing in the city and county of Denver and State of Colorado, have. invented certain new and useful` Improvements in Ore-Roasters; and I do declare the following to bea full, clear,

, and exact description of the invention, such aswill enable 'others skilled in the art to which it appertains to make and use the`` same, referencebeing had tothe accompanying drawings, and to the letters and vfigures ,i of reference marked thereon, which form a part. of this specification.

My invention relates to l improvement-s -in ore. roastm apparatus,- my improved construction being` more especially intended for producing what is known as. a magnetic roast, whereby the ore is heated to such an ftioiis 'very different from those required to extent thata large proportion of` itsV metallicvalues is made 'magnetic and may be sepi aia'ted from theother portion-ofthe ore by magnetism.

It is well known that in ordervto produce what is known as a magnetic roast, cond1- produce a sweet roast must obtain.

An iniportant feature of iuy ip iiiproved construction consists iii mechanism w iei'ebyI 'the vore is completely removed from the roasting hearthv after it has traveled a predetermined distance, ,or after ithas been subjected to the action of the heat fora predetermined period. y

In my improved construction I have illustrated two instrumcntalities for` removing the ore from the hearth,`either of which se arately, or both of which/combined, may

In my improved apparatus I have illustrated a circular hearth mounted to` rotate in a horizontal lane. In orderto removethe oreV from tie. hearth at the proper period, I have arranged an endless traveling. brush whose lower run travels transversely across the hearth in suchl a lane as to Ybrushtheroasted .ore therefrom. I have also employed a conduit for delivering air under pressure to thehearth 1n a 'transverse direction whereby the force of the' air `currentrenioves tlieore from the hearth. This'air. may be employed for re-l l Bpeoication o! Letters Patent. Application n led December l1, 1908. Serial No. 486,928.

.A moved Patented Sept. 13, 1910.y

moving the ore' from the hearth either alone or in combination with the brush, as heretofore explained; 'f In order to prevent the possible overheating of the ore during its travel with. the ro-- tary hearth `from the feed hopper to theremoving agency, I employ receptacles through which water is passed4 and in which it is continually 4changin for vcooling purposes, `the said receptac es ling placed 'in suitable proximity to the roasting hearth, referabl andabove the saine.` ,Any desired number of these receptacles `for ,cooling water may be employed, as circumstances may require.

Ininy improved ore roasting apparatus, stationary plows loirabbles4 may be emplayed, adapted to stir the ore upon the iearth as .the-lattertravels underneath-'the rabbles. W Y' Having ybriefly outlined my im ro'ved construction, I will proceed todesc'ribe the same in detail, references being made to `theaccou'ipanying drawing in whcliis illustratedl au euibodiuient thereof. I

In thisdrawing, Figure 1 .isahorizontal section taken through my .improve furnace on the, line 1.-1 Figa-l' looking downwardly,

Fig. 2 is alsectioii taken transversely throiig'h section isV taken approximately on. the line 2--2 Fig. 1, the parts being shown on a larger scale. `Fig. 3 is a fragmentary lon- A itudinal section of the hearth taken on the fine 3-3 Fi 2. Fig. 4 is a transverse section of the earth' taken `oii the line 4--4 Fig. 1, looking in. the direction ofthe arrow. Figs. 5 and6 are secti'onstaken on the lines .5--5 and 6-6, Irespectively, of Fig. 1, viewed in the direction of the arrows. Fi l. A7 is a fragmentary view lookin downward y a view looking in the direction of arrow 7 Fig. Fig. 8 is a detail view of one,of the. units or sections forming the endless brush. Fi 9 is a section taken on the line 9-9 Fig. Fi 10 is a top plan view of a nozzle `.for delivering the air blast to the ioastin 'chamber whereby the ore is re iom 'the hearth.

extending 'transversely across It e lheart the parts being shown-on a smaller Scale.`

upon the lower run of the en( less brush, or-

the hearth, cutting the feed hopper.- This l vsuitable speed for the purpose.

The same reference characters indicate the same parts in all the views.

Let the 'numeral 5 'designate a circular roasting chamber in which a hearth 6 is l mounted to travel for ore roasting purposes.

As shown in the drawing the bottom of the hearth is equipped with hangers 7 in which Mounted above the hearth is a ho per 15 into which the ore to be treated is ed, and from which this ore designated 16 is de-l livered to the hearth vthrough the agency of a feed roll 17 (see Fig. 3). y

Located a short distance from the hopper, and in communication with the roasting chamber, is a furnace 18 having a fuel hearth 19 separating the combustion chamber 20 from the ashpit 21. The combustion chamber of the furnace is in communication with the roasting chamber 5. by an opening 22. The furnace is provided with a feed opening 23 normally closed by a door 24. The ashpit is provided 'with an opening 25 normally closed by .a door 26.

Located beyond the furnace 18 in the direction in which the hearth is traveling, is a receptacle .27 containing cooling water 28 which is delivered tothe receptacle by a conduit 29 and escapes therefrom through a conduit 30 provided with a cont-rolling valve 31. This receptacle extends transversely across the roasting chamber slightly above the hearth, whereby its cooling influence is exertedA upon the ore vcarried by the hearth. to prevent the latter vfrom becoming too highly heated in order to accomplish the best results in obtaining a magnetic roast.

.lt will be understood that anydesired\ number of these ore cooling` receptacles may be employed. ln the drawing two of these are illustrated. One or more may be used, according to circumstances, much depending upon the length of the roasting chamber, or the distance from the feed hopper to the location' where the ore is removed from the endless tra velingl'iearth.

Beyond the second receptacle 27 for the cooling water, and located at a short distance from the feed hopper, measured in a direction the reverse of'vthat in which the hearth is traveling, is an endless traveling brush 32 actuated by sprocket wheels l?) mourned upon shafts B4. This brush passes through the roasting ch'ambcr and extends transversely across the hearth, the loweirun of the brush hugging the hearth closely for the purpose of comple'telyremoving'the ore therefrom after it has traveled a predetermined distance in the roasting chamber. The ore removed from the hearth by the brush passes into a housing 35, falling thence into the bottom thereof, in which a screw conveyer 36 is located for the` purpose of removing the roasted ore therefrom.

It will be understood that the endless brush may be of any suitable construction. As shown in the drawing, it is assumed that the brush is composed entirely of metal, the bristles 37 being formed of steel. Each brush 'section 38 is connected atitsextrem'ities with a link 39'of an endless traveling chain 40.. As shown 'in the drawing, the links with which the brush .sections are'conf nected, are provided withl lips 41 which are secured to the backs ofthe brushes by fasten- .ing devices 42. t

Located between the hopper 15 and the endless brush 32 is a housing 43 which passes transversely above the hearth for-ming a chamber 44 at one side of the roasting chamber, and having an escape opening 45 for the air, the said opening bcingcovered by a number of screens 46 arranged one above another and supported between a depending wall 47 and the side wall 8 farther from the roasting chamber. l

A nozzle 49 is `connected with the housing as shown at 50 near the inner 4edge of the hearth for delivering an air blast across the hearth in a transverse direction, whelreby the hearth is thoroughly cleaned of its ore particles, incase any portion of the ore,` no matter how small, has escaped the action of the endless brush. As shown in the drawing, the discharge extremity of this nozzle is flattened as shown at 51, andenters an opening formed in the housing, the 'nozzle being arranged to deliver 'the air blast'to strike Vthe hearth inclined in a direction slightly inclined to the horizontah whereby the blast sweepslacross the hearth and lremoves every particle of ore therefrom. The extremity of thej nozzle 49 remote froni the hearth is connected with an air conduit 52 provided with a valve From the foregoing description the Iuse and operation of'my improved'ore roasting apparatus. will'be readily understood.

The ore to be treated is first delivered' to the hopper 'l5 from which it passes to the hearth l, w'hich is traveling in the direction indicated by the arrow in Fig. 1. 'lhe roasting chaniber receives its heat from the furnace 18, which is connected with the chamber a short distance forward of the hopper. as hereto'lore explained. s the hearth con-- tiuues to travehthe ore which is fed thereto is carried therewith and passes underneath the first cooling chamber 27, hence to the second cooling chamber, and tinally watches the endless brush 32 which is traveling in a direction crosswise or transversely o'f the hearth and in Contact therewith, for the purpose of removing the pulverized ore therefrom.` Any ore that may have escaped t-he brush, Will be removed yfrom the hearth by theair blast. i

The ore roasting chamber may be equipped With stationary rabbles 54, which aresupported by the'side walls of the roasting chamber and engage the ore upon-the hearth for the purpose of stirring the ore and bringing new surfaces thereof into contact with the oxidizing atmosphere of the furnace. These rabbles may, or maynot be used, ,as desired. It is Ithou 'ht it will be found practicable to feed t e ore to the hearth insuch a thin layer that no stirring or rabbling will be necessary for the pur'- poses of a magnetic roast. If, however rab bling is required, it may be performed in the manner just explained.4

, It may be stated that the arch or top vva'll\` of the furnace is cut away between the vertically dis osed walls or ledges 55 and 56, between w ich walls the hopper. thehousing for receiving the air blast, and the endless traveling brush are located.

, While I' have illustrated anapparatus for removing the ore from the hearth by a direct blast of air, it is evident that the same purpose may be accomplished by suction, yand the claims of this specification must be construed of sufficient scope to'cover the yremoval of theA ore from the hearth through the agency `of an air current, whether direct or by suction.

.The object of completely removing the ore from the hearth at predetermined intervals, or after the ore has remained a predetermined period, under the influence of the heat. is to prevent the possible overroasting of the ore or a portion thereof, for the purpose of magnetic separation.

, In furnaces for ordinary roasting, or for the producing of what is ordinarily termed a sweet roast, meaning that practically all of the sulfur and other impurities which retard the separation of the metallic values from the gangue, are removed, there is no absolutel necessity for the complete removal 4of the ore from the hearth atany particular or predetermined time, since the remaining of aportion of the ore upon the hearth for an indefinite eriod will do no harm. In other Words, or ordinary ore roasting pui-- poses, Where a sweet roast is required, an

over-roast or the leavin of a ortion of the ore upon the hearth or a onger period than is absolutely necessary, in order to-secure a proper roast, does not injure the ore for the purpose intended. On the contrary, for the purposes of a magnetic roast, the time during which the ore may be subjected required for producing a sweet4 roast.

Having thus described my invention, what I claim is:

1. An oreroasting apparatus comprising an endless traveling horizontally disposed hearth, an endless travelingbrush composed of hinged sections 'extending transversely across the hearth, and means for completely removing the ore from the hearth at a predetermined point of travel of said hearth, substantially as described. i

2. An ore roasting apparatus comprising ya circular hearth mounted to rotate in a roasting chamber an endless traveling brush composed of hinged sections extendlng across said hearth as means of removmg fore therefrom, and a blast for completely removing the ore from the hearth, substantially as described.

3. An ore roasting apparatus comprising anendless traveling hearth mounted to-rotate 1n a roastlng chamber, an endless traveling brush composed of hinged sections' Vfor removing ore therefrom, and means at a predeterlnined point for regulating the tem erature of the ore, substantially as descri d.

4. In an ore roasting apparatus, the combination of ahorizontally disposedl hearth of circular shape mounted to rotate, means forrfeedinr the ore to be treatedv to the hearth, and apparatus for delivering a blast of air crosswlse of the hearth for the purpose of completely removing tine particles r of the ore from the hearth, substantially as described.

5. The combination with an ore roasting chamber, of a hearth mounted therein, and means for `delivering to the hearth an air blast ldirected crosswise ofthe hearth for the purpose of completely removing Iine particles of the ore from the hearth' while in operation, substantially as described.

6. The combination with an' ore roastin chamber, of a hearth mounted to trave therein, an endless traveling brush extending transversely across the hearth, and means for delivering to thel hearth an 'air blast in a transverse direction, substantially as described.

7 The combination with an ore roasting chamber, of a traveling hearth, coolinr tanks arranged inthe circuit thereof, and

to travel from the hearth means for completely removing fine particles of the ore fromrthe hearth after the ore has been carried a predetermined distance' through theroast-ingl chamber, sub-'- stantially as described.

8. In an ore roasting apparatus, the com- A bnation of a' traveling hearth, and 'appa-A ratus for removin ne particles of the ore rough the agency of an air current of' suitable strength,4 substan- 10.

tially as described.

In testimony whereof I ax my signature in presence of two witnesses. 

